The "Black Mystery" was a special release for France in late 2008. The offering consisted of a standard "Old" TEN bottle with a special Piano Black wooden display box. 3,000 of these were made, and half of them were alotted to La Maison du Whisky. Of special note, there were 300 of the Black Mystery released with a special wax seal, but I do not know how these were released or if there was a price premium. I thought this may have been offered to celebrate the WOTY for the TEN, but I can't be sure.

There have been two recorded bottle codes for the "Black Mystery", which are "L8 037" (February 6th) and "L8 057" (February 26th).

UPDATE: Whisky Auction 10-10 offered a Black Mystery with bottle code L7 323 (November 19th). The label type matches the labels for the confirmed bottle codes of Black Mystery, and it is entirely possible the TENs used for the Black Mystery included multiple bottle codes. Essentially, the main attraction for this release is the box and wax kit, and the bottle can be changed at any time without the ability to verify one way or the other.